Air Quality Monitoring for SO2 in Bulgaria: Comparison of diffusion tube monitoring with data from automatic measuring stations in Golemo Selo, Galabovo, Dimitrovgrad and Pernik, October 2025 – February 2026

Brigden, K., Farrow, A. (2026) Air Quality Monitoring for SO2 in Bulgaria: Comparison of diffusion tube monitoring with data from automatic measuring stations in Golemo Selo, Galabovo, Dimitrovgrad and Pernik, October 2025 – February 2026. Greenpeace Research Laboratories Technical Report GRL-TR-01-2026